I have a Goldberg Ultimate ARF with a OS SF .61, it flys like a big old trainer. My favorite airplane. I just picked another one up from friend, this one was built from a kit, it has a OS FX 91 for power. Ive flown this one also, it does anything you can imagine. There are a couple differences between the two. The arf comes with one peice aluminum landing gear, while the kit has wire. And how they fasten the top wing to the center cabanes. I have seen the Dave Patrick Ultimate at a couple fly-ins. It is beautiful. Slighty bigger then the goldbergs. The guy who I bought the latests one from is getting one. Personally, I think the Ultimate is a much better looking airplane then the pitts, not saying the pitts is ugly. All bipes are kewl.